Shiro Oka

10.2k total citations
137 papers, 3.3k citations indexed

About

Shiro Oka is a scholar working on Pulmonary and Respiratory Medicine, Oncology and Surgery. According to data from OpenAlex, Shiro Oka has authored 137 papers receiving a total of 3.3k indexed citations (citations by other indexed papers that have themselves been cited), including 81 papers in Pulmonary and Respiratory Medicine, 48 papers in Oncology and 44 papers in Surgery. Recurrent topics in Shiro Oka's work include Gastric Cancer Management and Outcomes (75 papers), Metastasis and carcinoma case studies (32 papers) and Gastrointestinal Tumor Research and Treatment (31 papers). Shiro Oka is often cited by papers focused on Gastric Cancer Management and Outcomes (75 papers), Metastasis and carcinoma case studies (32 papers) and Gastrointestinal Tumor Research and Treatment (31 papers). Shiro Oka collaborates with scholars based in Japan, United States and Australia. Shiro Oka's co-authors include Shinji Tanaka, Kazuaki Chayama, Hiroyuki Kanao, Nana Hayashi, Motomi Terasaki, Shigeto Yoshida, Koichi Nakadoi, Fumio Shimamoto, Masaharu Yoshihara and Iwao Kaneko and has published in prestigious journals such as SHILAP Revista de lepidopterología, Gastroenterology and PLoS ONE.

In The Last Decade

Shiro Oka

122 papers receiving 3.2k citations

Peers

Shiro Oka

PRM

ONCOL

SURGE

GASTR

EPIDE

Kimihiko Yanaoka Japan

Tamara Matysiak‐Budnik France

Jae J. Kim South Korea

Naomi Sasaki Japan

Shiro Okamoto Japan

Keiko Sasaki Japan

Takao Maekita Japan

K Okita Japan

Daniel P. Vandersteen United States

Hala El‐Zimaity United States

Kimihiko Yanaoka Japan

Shiro Oka

2.2k ×0.9

PRM

845 ×0.7

ONCOL

1.8k ×1.5

SURGE

859 ×0.8

GASTR

208 ×0.8

EPIDE

Citations per year, relative to Shiro Oka Shiro Oka (= 1×) peers Kimihiko Yanaoka

Countries citing papers authored by Shiro Oka

Since Specialization

Citations

This map shows the geographic impact of Shiro Oka's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Shiro Oka with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Shiro Oka more than expected).

Fields of papers citing papers by Shiro Oka

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Shiro Oka. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Shiro Oka. The network helps show where Shiro Oka may publish in the future.

Co-authorship network of co-authors of Shiro Oka

This figure shows the co-authorship network connecting the top 25 collaborators of Shiro Oka. A scholar is included among the top collaborators of Shiro Oka based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Shiro Oka. Shiro Oka is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Ono, Atsushi, C. Nelson Hayes, Ryoichi Miura, et al.. (2025). Noninvasive prediction of the clinical benefit of immunotherapy in hepatocellular carcinoma. Journal of Gastroenterology. 60(9). 1053–1069.

Saeki, Issei, Tomokazu Kawaoka, Joji Tani, et al.. (2025). Efficacy of Lenvatinib and Atezolizumab Bevacizumab Combination Therapy in Patients With Combined Hepatocellular-cholangiocarcinoma. Anticancer Research. 45(3). 1117–1125. 1 indexed citations

Sumiyoshi, Tatsuaki, Kenjiro Okada, Shinya Nakamura, et al.. (2025). Standardization of surgical procedure for initially unresectable locally advanced pancreatic head cancer. Langenbeck s Archives of Surgery. 410(1). 226–226. 1 indexed citations

Tsuboi, Akiyoshi, Hidenori Tanaka, Ken Yamashita, et al.. (2024). Predictive factors of portal hypertensive enteropathy exacerbations based on long-term outcomes. BMC Gastroenterology. 24(1). 287–287.

Iijima, Noriaki, Shinya Nakamura, Yasutaka Ishii, et al.. (2024). A case of malignant lymphoma of the extrahepatic bile duct diagnosed by detailed imaging examination and endoscopic ultrasound-guided fine needle aspiration. Clinical Journal of Gastroenterology. 18(1). 176–182.

Kawaoka, Tomokazu, Yasutoshi Fujii, Shinsuke Uchikawa, et al.. (2024). Multidisciplinary treatment for patients with advanced hepatocellular carcinoma complicated by Vp4 portal vein tumor thrombosis: Combination of atezolizumab and bevacizumab after hepatic arterial infusion chemotherapy and radiotherapy: A case series. 5(6). e00325–e00325.

Fujii, Yasutoshi, Tomokazu Kawaoka, Ryoichi Miura, et al.. (2024). First-Line Durvalumab plus Tremelimumab Treatment for Unresectable Hepatocellular Carcinoma in Real-World Clinical Practice. Oncology. 103(8). 742–747. 3 indexed citations

Oka, Shiro, Shigeki Mori, Daisuke Kawaguchi, et al.. (2024). Transformation of a benzocorrole isomer into pyrrole-containing polycyclic molecules via copper-mediated cleavage and annulation. Organic Chemistry Frontiers. 12(3). 717–724. 1 indexed citations

Miura, Ryoichi, Atsushi Ono, Yasutoshi Fujii, et al.. (2024). Real-world efficacy and safety of durvalumab–tremelimumab as second-line systemic therapy after atezolizumab–bevacizumab in unresectable hepatocellular carcinoma. Medicine. 103(34). e39289–e39289. 5 indexed citations

10.

Yamashita, Ken, Noriko Yamamoto, Hidenori Tanaka, et al.. (2024). Comparative prediction of lymph node metastasis in pT1 colorectal cancer among Western and Japanese guidelines. Frontiers in Oncology. 14. 1475270–1475270.

11.

Hayashi, Ryohei, Yoshitaka Ueno, Ken Yamashita, et al.. (2023). Anti-tumor necrosis factor-alpha monoclonal antibody suppresses colorectal cancer growth in an orthotopic transplant mouse model. PLoS ONE. 18(3). e0283822–e0283822. 7 indexed citations

12.

Hayashi, Ryohei, Yoshitaka Ueno, Takuro Uchida, et al.. (2022). Promoting mechanism of serum amyloid a family expression in mouse intestinal epithelial cells. PLoS ONE. 17(3). e0264836–e0264836. 5 indexed citations

13.

Oka, Shiro, Shinji Tanaka, Shinji Nagata, et al.. (2019). Real-world learning curve analysis of colorectal endoscopic submucosal dissection: a large multicenter study. Surgical Endoscopy. 34(8). 3344–3351. 22 indexed citations

14.

Oka, Shiro, Shinji Tanaka, Shinji Nagata, et al.. (2017). Clinical outcomes of endoscopic submucosal dissection for colorectal tumors: a large multicenter retrospective study from the Hiroshima GI Endoscopy Research Group. Gastrointestinal Endoscopy. 87(3). 714–722. 56 indexed citations

15.

Oka, Shiro, et al.. (2017). Evaluation for the Clinical Efficacy of Colon Capsule Endoscopy in the Detection of Laterally Spreading Tumors. Digestion. 95(1). 43–48. 16 indexed citations

16.

Asayama, Naoki, Shiro Oka, Shinji Tanaka, et al.. (2015). Long-term outcomes after treatment for T1 colorectal carcinoma. International Journal of Colorectal Disease. 31(3). 571–578. 35 indexed citations

17.

Oka, Shiro & Shinji Tanaka. (2012). Magnifying Endoscopy for Early Colorectal Cancer. Nihon Daicho Komonbyo Gakkai Zasshi. 65(10). 793–799.

18.

Tanaka, Shinji, Mayuko Hirata, Shiro Oka, et al.. (2008). CLINICAL SIGNIFICANCE OF NARROW BAND IMAGING (NBI) IN DIAGNOSIS AND TREATMENT OF COLORECTAL TUMOR. Acta gastro-enterologica belgica. 50(5). 1289–1297. 9 indexed citations

19.

Kaneko, Iwao, Shinji Tanaka, Shiro Oka, et al.. (2006). Lymphatic Vessel Density at the Site of Deepest Penetration as a Predictor of Lymph Node Metastasis in Submucosal Colorectal Cancer. Diseases of the Colon & Rectum. 50(1). 13–21. 55 indexed citations

20.

Oka, Shiro. (1992). The tree limit and its dynamics on the western and northwestern slopes of mount fuji, central japan. 27(27). 1–28. 2 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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